Help with movement script

Code (CSharp):

1.    
2. using UnityEngine;
3.  
4. public class PlayerMovement : MonoBehaviour {
5.  
6.    
7.     public Rigidbody rb; // This is a reference to the Rigidbody component called "rb"
8.     public float forwardForce = 800f;
9.     public float moveSpeed = 10f;
10.  
11.      
12.     // We marked this as "Fixed"Update because we
13.     // are using it to mess with the physics.
14.     void FixedUpdate ()
15.     {
16.        
17.         rb.AddForce(0f, 0f, forwardForce * Time.deltaTime);  // Add a forward force
18.  
19.         transform.Translate(moveSpeed * Input.GetAxis("Horizontal") * Time.deltaTime, 0f, 0f, ForceMode.VelocityChange);
20.        
21.     }
22.  
23. }
24.  

Assets/PlayerMovement.cs(18,105): error CS1503: Argument `#4' cannot convert `UnityEngine.ForceMode' expression to type `UnityEngine.Space'

 

Your error is telling you what is wrong. Look at line 19. You cant pass ForceMode.VelocityChange into Transform.Translate because Transform.Translate is not a physics function.
Take a look at this:
https://docs.unity3d.com/ScriptReference/Transform.Translate.html
Let me know if you don't understand something

 

Thank you for your reply! I am currently using the whole of line 19 to move a cube with arrow keys left and right. Is there any way to implement ForceMode.VelocityChange to that movement?

 

Well, you don't actually need ForceMode.VelocityChange for that to work. Why do you want to use ForceMode.VelocityChange? That can only be used with Rigidbody functions, transform.Translate is not a rigidbody function. You are able pass ForceMode.VelocityChange into line 17, because AddForce is a rigidbody function.

 

Well the controls feel very very slow and I saw a tutorial on youtube. He used ForceMode.VelocityChange and it worked very nice. The problem is he didnt use the same method as me. He used:
if (Input.GetKey(d))
{
rb.AddForce(sidewaysForce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);
}
Is this a better method than mine to move a cube left and right.
I was originaly following that tutorial but it he said that method wasnt the best so I made the whole transform.translate thing.
(Btw. sorry for all of the stupid questions I am fairly new to C#, and the poor gramar(Im not a native english speaker)).
What is your opinion on what I should do?
Thanks in advance!

 

It's alright, we all have to start somewhere

If the controls feel very slow, you could increase

moveSpeed

to a larger number to get it to respond quicker.
Personally, I don't think you should use transform.Translate with rigidbody's, as it's not a very stable approach. You should choose one or the other.

You could use ONLY rigidbody functions like this:

Code (CSharp):

1. Vector3 force = new Vector3 (moveSpeed * Input.GetAxis("Horizontal"), 0.0f, forwardForce);
2. rb.AddForce(force, ForceMode.VelocityChange);

Or use you could use transform.Translate only like this:

Code (CSharp):

1. transform.Translate (moveSpeed * Input.GetAxis("Horizontal") * Time.deltaTime, 0.0f, forwardForce * Time.deltaTime);

You can choose which method you prefer.
Also when using Rigidbody.AddForce, you should not multiply the forces by Time.deltaTime, but when using transform.Translate, you should.

 

Thank you very much!!!

 

Your welcome!